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UNITED STATES GEORGE W. LEIGHTON, OF FINDLAY, OHIO, ASSIGNOR TO THEDALZELLGIL- PATENT OFFICE.

MORE & LEIGH'TON COMPANY, OF SAME PLACE.

MANUFACTURE OF GLASSWARE.

SPECIFICATION forming part of Letters Patent No. 402,090, dated April23, 1889.

' Application filed February 1, 1889. Serial No. 298,393. (Specimens) Toall whom it may concern:

Be it known that I, GEORGE W. LEIGHTON, a citizen of the United States,residing at Findlay, in the county of Hancock and State of Ohio, haveinvented or discovered certain new and useful Improvements in theManufacture of Glassware, of which improvements the following is aspecification.

The invention described herein relates to certain improvements in themanufacture of glassware, and has for its object the development of ametallic luster upon the surface of glass articles, or upon a raisedornamentation thereon, and also the development of colors having ametallic luster upon the surface of the article, or in a'raisedornamentation thereon.

In general terms, the invention consists in the method hereinafter morefully described and claimed.

In the practice of my invention the operator gathers upon his blow-pipea sufficient quantity of glass having metallic constituents which, whenheated, as hereinafter stated, will produce a metallic luster upon thesurface of the article. The metallic constituent or constituents of theglass may be such as will in the subsequent treatment of the articleproduce a change of color,'or it may be such as willbe unaffected by anysubsequent treatment, except as regards the development of the metallicluster. The ball thus gathered is then blown to shape either complete oronly partial if a colored ornamentation is to be formed. If a raised andcolored ornamentation is desired, the ball is blown in a mold having amatrix adapted to impart a preliminary shape to the ball, but

considerably smaller than the desired article.v

In the walls of this mold is formed the reverse of the ornamentation,the parts of such reverse ornamentation in the walls of the mold beingin closer relation to each other and deeper than the projection whichthe ornamentation is to have on the surface of the finished article. Thecomplete or partiallyfinished articles, which have been sufficientlycooled in the mold or otherwise, are then heated in a sulphurous flame,or, when hot,

subjected to the fumes or vapors of sulphur. The reheating to which thearticles are thus subjected develops on the surface of the article or inthe raised ornamentation a peculiar metallic luster, due, as I nowbelieve, to the action of the sulphur upon the metallic con stituent orconstituents of the glass. If the metallic constituent or constituentsemployed are of such a character as will change in color when cooled andreheated, as above stated, the reheating will also develop on the sur-'face of the article, or in the raised ornamentation, a color-e. g.,ruby, pink, &c.-dependent upon the constituents of the glass. Byproperly reheating the articles, whether completed or only partially so,the development of the metallic luster or of the color and metallicluster can be confined to any portion of the surface of the article orto the raised ornamentation, whose parts in the partiallyformed articleare in such close relation to each other and project such a distancefrom the surface as to become reheated to the proper degree before thebody portion. After this reheating the article, if it has beenpreviously blown to the desired size and shape, is finished in the usualmanner and then annealed. The partially-formed article having the raisedornamentation is, after being. reheated and subjected to the fumes ofsulphur, again blown in a mold having a matrix adapted to impart thefinished size and shape to the article. During this completing orfinishing operation the parts of the raised ornamentation are spreadapart to the desired relation to each other, and also somewhatflattened. After this second blowing the article is finished in theusual manner and then annealed.

I claim herein as my invention 1. As a step in the manufacture ofglassware, the method herein described of producing a metallic luster onthe surface of the glassware, which consists in reheating a wholly orpartially shaped article formed of glass having a metallic constituentand while hot subjecting the article to the action of sulphurous fumesor vapors, substantiallyas set forth.

2. As a step in the manufacture of glass- In testimony whereof I havehereunto set ware, the method herein described of develmy hand. oping ametallic luster and a color 011 the surface of the glassware, whichconsists in GEORGE W. LEIGHTON. heating a wholly or partially shapedarticle having its surface formed of glass having a Witnesses: metallicconstituent in a snlphurous flame, V. H. DUVAL, substantially as setforth. JOHN W. GRIMM.

